Even at the most basic molecular level sex matters---and it's not just about hormones. Did you know that muscle stem cells from female mice regenerate new muscle faster than cells from male mice? And cells from male and female mice respond to stress differently. Yet most researchers who use basic cell cultures in their work do not even identify the sex of the cells they use.
We already know that this lack of sex identification can have serious consequences when we study new therapeutics. Most adverse drug effects reported occur in female humans! Since most basic drug studies start with cell cultures, shouldn't we be comparing the two sets of cells at the start of the "experiment" before it reaches humans??? It certainly would be cheaper and may prevent serious consequences once the drug is used in humans!
At first, it is easy to blame hormones for the differences but researchers have found that hormones may not always be the culprit. The way a cell metabolizes its food (energy) may be different by sex and other biologic functions could be affected by sex. A recent commentary by Elizabeth Pollitzer explores this issue and makes a plea for researchers to include the sex in their publications on all studies--cellular, animal and human.

When patients undergo an acute myocardial infarction, lifestyle changes are necessary to reduce the risk of relapse. Yet research shows that women and minority patients have a more difficult time with risk factor modification efforts. A recent study published in the
Did you know there are differences in the physical, psychological, social, and spiritual effects of substance use and abuse on women and men? Those differences have implications for treatment in behavioral health settings. The U.S. Substance Abuse and Mental Health Service Administration (SAMHSA) offers two reports that emphasize gender-specific research and best practices, such as common patterns of initiation of substance use among women and men and specific treatment issues and strategies. These reports demonstrate how important it is to advocate for sex and gender based research across all body systems, something our
National Association of Colleges and Employers. The report found that females with new bachelor degrees were offered an average of $36,451 compared to $44,159 for their male counterparts. Even when salary is adjusted by college major (14 were included), men come out ahead in all except two areas: engineering and liberal arts/humanities. Report author Edwin Koc noted that while gender pay disparities are often linked to women more frequently leaving the work force, he did not feel that was the cause in this study.